In view of a rare 500 kV transformer turn-to-turn short circuit accident, the oil chromatography before and after the accident, partial discharge online monitoring and final disintegration analysis were conducted. It was concluded that the accident was caused by a turn-to-turn short circuit in the high-voltage winding. The insulation impact of the copper sulfide phenomenon in the accident was analyzed. The cause of the accident was analyzed from the aspects of equipment welding, insulation quality, external operating environment, etc., and preventive measures were proposed for reference by power equipment operation and production enterprises.
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